Concrete Injection – Uses & Technical Details

What is Concrete Injection?

Concrete injection is a repair technique used to fill cracks, voids, or delaminated zones within concrete structures. It restores structural integrity, stops water ingress, and extends the service life of concrete elements by injecting specialized materials like epoxy, polyurethane, or cement-based grouts.

Key Uses and Applications

1. Crack Repair

Injection is widely used for repairing structural and non-structural cracks. It prevents water leakage, corrosion of reinforcement, and further propagation of cracks. Depending on crack width and activity, either epoxy (for structural) or polyurethane (for waterproofing) is used.

2. Waterproofing

In tunnels, basements, water tanks, and underground structures, injection of polyurethane or acrylic gels helps seal leaks by filling cracks, joints, or honeycombs and forming a water-impermeable barrier.

3. Structural Strengthening

Epoxy injection is used for structural bonding, re-establishing the load-bearing capacity of cracked members such as beams, columns, and slabs—without enlarging the cross-section.

4. Void Filling

In slabs, pavements, or under machine bases, concrete injection helps fill internal voids or air pockets caused by poor compaction or settlement, restoring uniformity and support.

5. Soil Stabilization & Foundation Repair

Cementitious or polyurethane injections are used for soil stabilization, underpinning, and lifting sunken foundations, especially under heavy structures or roads.

6. Delamination and Honeycomb Repair

Where concrete has delaminated or suffered poor compaction, injection ensures full contact between surfaces and restores monolithic behavior.